실리콘 wafer sludge로부터 얻어진 SiC의 단광화 기술

구성모,윤수종,김혜성,Koo, Seong Mo,Yoon, Su Jong,Kim, Hye Sung 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.1

Waste SiC powders obtained from silicon wafer sludge have very low density and a narrow particle size distribution of $10-20{\mu}m$. A scarce yield of C and Si is expected when SiC powders are incorporated into the Fe melt without briquetting. Here, the briquetting variables of the SiC powders are studied as a function of the sintering temperature, pressure, and type and contents of the binders to improve the yield. It is experimentally confirmed that Si and C from the sintered briquette can be incorporated effectively into the Fe melt when the waste SiC powders milled for 30 min with 20 wt.% Fe binder are sintered at $1100^{\circ}C$ upon compaction using a pressure of 250 MPa. XRF-WDS analysis shows that an yield of about 90% is obtained when the SiC briquette is kept in the Fe melt at $1650^{\circ}C$ for more than 1 h.

Mg-1.4 wt%Ca-xwt%Zn 합금의 이단 용체화 및 시효처리에 따른 미세구조 변화와 물성에 관한 연구

구성모 ( Seong Mo Koo ),정하국 ( Ha Guk Jeong ),김택수 ( Teak Soo Kim ),김혜성 ( Hye Sung Kim ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.9

Optimum heat treatment conditions to improve the hardness and corrosion resistance of ternary Mg-Ca-Zn alloys have been studied, based on the theoretical models and DSC (Differential scanning calorimetry) experimental data. Two-step heating process at 420 ℃ and 480 ℃ has been applied and we have found that the low melting point phase, Ca2Mg6Zn3 can effectively be dissolved into α-Mg matrix without premature melting. Due to preceding treatment at lower temperature followed by the second stage solid solution heat treatment at 480 ℃, Mg-1.4 wt%Ca-xwt%Zn alloys (x=0, 1.5 and 4.0) exhibit improved corrosion resistance than that from the single step solid solution treated alloy at 480 ℃. However, aging treatment of the alloy at 200 ℃ has led to the homogeneous precipitation of Ca2Mg6Zn3 and Mg2Ca phases in the matrix as well as at the grain boundary. This microstructural change results in the deterioration of corrosion resistance mainly originated from galvanic corrosion between the matrix and the precipitates. The hardness of Mg-1.4%Cax% Zn alloy, on the other hand, significantly increases with Zn addition by applying two-step solid solution and aging heat treatment.

Theet ching properties of Al₂O₃ thin films in N₂/Cl₂/BCl₃ and Ar/Cl₂/BC₃ gas chemistry

구성모(Seong-Mo Koo),김동표(Dong-Pyo Kim),김경태(Kyoung-Tae Kim),김창일(Chang-Il Kim) 대한전기학회 2004 대한전기학회 학술대회 논문집 Vol.2004 No.11

수생태계 부영양화 분석을 위한 비색법 기반의 광학식 센서 신호처리회로(ROIC)구현

구성모 ( Seong Mo Koo ),정동건 ( Dong Geon Jung ),최영찬 ( Young Chan Choi ),김경규 ( Kyung-kyoo Kim ),공성호 ( Seong Ho Kong ) 한국센서학회 2020 센서학회지 Vol.29 No.4

In this study, a read-out integrated circuit (ROIC) that can be applied to a colorimetry-based optical sensor for analyzing total phosphorus and total nitrogen was developed and characterized. The proposed ROIC minimizes the effect on temperature fluctuation, improves sensitivity, and extends the dynamic range by utilizing a dual optical path and feedback control circuit. Using a dual optical path makes it possible to calibrate the output signal of the optical sensor automatically, along with the temperature fluctuation. The calibrated voltage is fed back into the measurement stage; thus, the output current of the measurement is adaptively controlled. As a result, the sensitivity and dynamic range of the proposed ROIC are improved. Finally, a total-phosphorus analysis was conducted by utilizing the ROIC. The ROIC was found to operate stably over a wide temperature range.

장회전 이상의

구성모(Seong Mo Koo),김용민(Yong Min Kim),정기제(Gih Jah Jeong),조봉기(Bong Kee Cho),백효종(Hyo Jong Baek),이중기(Choong Ki Lee) 대한소화기학회 1996 대한소화기학회지 Vol.28 No.6

Malrotation of rnidgut occurs when the normal rotational process and fixation of intestine fail to take p]ace. The second stage during which midgut loop starts returning to abdomen from urnbilical cord is the rnost frequent period of intestinal malrotation. Malrotation is the most common anomaly in this group. Non-descent of cecum, in which this structure remains in the subhepatic position is the best known example. Most symptomatic anomalies of intestinal malrotation are found in the neonatal period and many remain asymptomatic and are incidentally found either during laparotomy or investigation of unrelated symptoms in adult life. We report a case of intestinal malrotation who has been relatively asymptomatic during his life. His presenting left lower abdominal pain and constipation is far from typical symptoms of intestinal malrotation. Only conservative treatment is needed to relieve his symptoms. (Korean J Gastroenterol 1996;28: 884 - SS7)

건강성인에서 성별 및 연령별 혈청지질의 정상치 - 특히 이상지혈증의 빈도를 중심으로 -

권삼(Sam Gweon),구성모(Seong Mo Koo),조봉기(Bong Kee Cho),정기제(Gih Jeh Jeong),이중기(Choong Ki Lee),정의룡(Eui Ryong Cheong),류재근(Jae Kean Ryu),이봉렬(Bong Ryeol Lee),채성철(Shung Chull Chae),전재은(Jae Eun Jun),박의현(Wee Hyun 대한내과학회 1996 대한내과학회지 Vol.50 No.2

N/A mg/dl) in men and women was 36.8 and 44.0%, respectively and that of high LDL-cholesterol(≥160 mg/dl) was 26.6% in men and 35.2% in women. Their frequencies were increased with age in both sexes. 4) There were no significant, differences in the mean values of total cholesterol, triglyceride, LDL-cholesterol, HDL-cholesterol and atherogenic index by residency. The frequency of high total cholesterol(≥200mg/dl) in Taegu and its rural area was 40.7% and 35.5%, respectively. Conclusion: These findings suggest that the mean concentrations of total cholesterol, triglyceride and LDL-cholesterol in men and women vary with age. The frequency of hypercholesterolemia (≥200 mg/dl) in men and women was about 40%, and increased with age. Values of HDL-cholesterol were not affected by age and sex

광촉매 반응을 이용한 총유기탄소 분석 칩

김승덕 ( Seung Deok Kim ),정동건 ( Dong Geon Jung ),권순열 ( Soon Yeol Kwon ),최영찬 ( Young Chan Choi ),이재용 ( Jae Yong Lee ),구성모 ( Seong Mo Koo ),공성호 ( Seong Ho Kong ) 한국센서학회 2020 센서학회지 Vol.29 No.2

Total organic carbon (TOC) analysis equipment, which was previously used to prevent eutrophication in advance, is heavy, bulky, and expensive; therefore, so it is difficult to be carried and has been used as an experimental unit. In this study, a through-carbon analysis chip that integrates pretreatment through photocatalytic oxidation and carbon dioxide measurement using a pH indicator was investigated. Both the total carbon - inorganic carbon method and the nonpurgeable organic carbon (NPOC) measurement method require an acidification part for injecting an acid solution for inorganic carbon measurement and removal, an oxidation part for total carbon or NPOC oxidation and a measurement part for Carbon dioxide (CO₂) measurement. Among them, the measurement of oxidation and CO₂ requires physical technology. The proposed TOC analysis chip decomposed into CO₂ as a result of the oxidizing of organic carbon using a photocatalyst, and the pH indicator that was changed by the generated CO₂ was optically measured. Although the area of the sample of the oxidation part and the pH indicator of the measurement part were distinguished in an enclosed space, CO₂ was quantified by producing an oxidation part and a measurement part that shared the same air in one chip. The proposed TOC analysis chip is less expensive and smaller, cost and size are disadvantages of existing organic carbon analysis equipment, because it does not require a separate carrier gas to transport the CO₂ gas in the oxidation part to the measurement part.

치명적 기관지천식 환자의 임상상

이종명(Jong Myung Lee),황윤근(Youn Keun Hwang),윤종수(Jong Soo Yun),강천일(Cheon Il Kang),서영익(Young Ik Seo),김능수(Nung Soo Kim),구성모(Seong Mo Koo),조봉기(Bong Kee Cho),강영모(Young Mo Kang),이중기(Choong Ki Lee) 대한내과학회 1997 대한내과학회지 Vol.52 No.1

N/A The number of persons with HIV infection in Korea have increased steadily, total number of HIV infection in Korea were 478 on August, 1995. To investigate the clinicoimmunologic manifestation of AIDS in Korea, we reviewed complete blood counts (CBC), CD4 counts, serum β2-microglobulin level, opportunistic infections and cause of death for 19 AIDS patients who had been admitted or visited at Pusan national university hospital during the period of January, 1990 to August, 1995. 1) The predominant mode of HIV transmission was heterosexual contact(18), other modes of transmission were homosexual contact(1). Clues of diagnosis of HIV infection were routine occupational health examination(14), and opportunistic infection symptoms such as fever, coughing(4). 2) Mean CD4 cell counts(/mm3) were 53±72 totally, 22±27 for 8 dead patients at mean 2 month before, 91±87 for 7 living patients. There were not significant difference(p>0.05). 3) Serum β2-microglobulin(MG;ug/ml) was measured at 12 patients, mean serum β2-MG level was4.8±7.3 totally, 7.1±10.3 for 6 dead patients at mean 1.3 month before, 2.5±0.4 for 6 living patients. There were not significant(p>0.05). 4) At CBC examination, WBC(/mm3) was 5,932±2,899 totally, 5,452±3,436 for 10 dead patients, 6,500 ±2,221 for 9 living patients(p>0.05). Hb(g/dl) was 11,4±2.8 totally, 9.4±1.8 for dead patients, 13.6±1.8 for living patients(p<0.05). Lymphocyte count(/mm) was 1,255±800 totally, 731±424 for dead patients, 1,838716 for living patients(p<0.05). ESR(mm/h) was 72±47 totally, 97±33 for dead patients, 47±47 for living patients(p<0.05). 5) Opportunistic infections had developed at 14 patients, candidiasis 7, pneumocystis carinii pneumonia 5, tuberculosis 3, cytomegalovirus infection 2, herpes zoster 3, toxoplasmosis 1, cryptococcal infection 2, bacterial pneumonia 5, and herpes simplex l. Malignant lymphoma had developed in 1 patient. 6) Mean survival interval from diagnosis of HIV infection to death was 32.8±19.1 months, and the most common cause of death was pneumocystis carinii pneumonia, and other causes of death were meningitis, bacterial pneumonia and AIDS-wasting syndrome. Based on these results, We concluded that CD4 counts, serum β2-microglobulin level, Hb, total lymphocyte count and ESR in AIDS patients are specific laboratory markers of progression and prognosis of AIDS, the most common opportunistic infection was candidiasis, and the most common cause of death in AIDS patients was pneumocystis carinii pneumonia.

장회전 이상의 1예

구성모,김용민,정기제,조봉기,백효종,이중기 大韓消化器病學會 1996 大韓消化器病學會誌 Vol.28 No.6

당뇨병 백서의 대동맥에서 열 자극이 혈관 운동성에 미치는 영향

구성모,이순희,한정훈,정기영,김인겸,김정국,하승우,김보완 대한당뇨병학회 2002 Diabetes and Metabolism Journal Vol.25 No.5

연구배경:열자극은 열자극 단백질의 생성을 유도하여 유해한 자극에 대한 세포내 반응을 유도하는 것으로 알려져 있다. 열자극 단백질은 여러 조직에서 발현되며 일부 열자극 단백질은 산화 스트레스에 대해 세포를 보호하는 기능을 나타내기도 한다. 최근 보고에 의하면, 일부 열자극 단백질은 혈관운동성과 관련이 있다고 한다. 당뇨병은 수축물질에 대한 과다한 수축과 이완물질에 대한 이완능의 저하를 특징으로 하는 혈관 운동성의 장애를 초래하는 대표적인 질환이다. 이런 혈관운동성의 장애는 당뇨병성 혈관병증의 병인에 중요한 요소이다. 그러나 고혈당의 조건에서 혈관 운동성에 대한 열자극의 효과에 대해서는 잘 알려져 있지 않으며 그 기전에 대해서도 밝혀진 것이 없다. 이에 스트렙토조토신으로 당뇨병을 유발한 백서 대동맥에서 열자극이 혈과운동성에 미치는 영향에 대하여 연구하였다. 방법:당뇨병 백서 대동맥을 적출하여 대동맥환을 준비하고 장치한 후 42도에서 45분간 열자극을 가한군과 열자극을 가하지 않은 군사이의 혈관 수축물질에 대한 수축반응과 이와물질에 대한 이완반응을 측정하였다. 혈관반응을 측정한 후 대동맥환을 얼리고 열자극단백질 HSP 70의 발현을 조사하였다. 결과:당뇨병 백서와 정상 대조군 백서의 대동맥에서 KCI과 phenyephrine에 대한 혈관 수축반등은 열자극을 준 군에서 주지 않은 군에 비해 현저하게 증가하였다. 열자극은 당뇨병과 정상 대조군의 대동맥에서 혈관수축반응의 증가 뿐만 아니라 HSP 70의 발현을 의미있게 증가시켰다. 정상 대조군의 대동맥에서 아세틸콜린에 대한 이완반응은 열자극을 준 군과 주지 않은 군사이에 통계학적 유의한 차이는 없었다. 반면에 당뇨병 백서의 대동맥에서는 열자극을 준 군이 주지않은 군에 비해 아세틸콜린에 대한 이완반응이 유의하게 감소하였다. 결론:이상의 결과는 당뇨병과 정상쥐에서 열자극에 대한 혈관 수축반응의 증가는 HSP 70의 발현을 유도하여 일어날 수 있음을 시사하여 당뇨병군에서 정상 대조군에 비해 열자극에 대한 이완반응이 감소하는 기전은 많은 연구가 되어야 할 것으로 생각된다. Background: Heat shock has been known to change cellular response to noxious stimuli by inducing heat shock proteins(HSP). HSP are expressed in many tissues, and increased expression of some HSP enhances the survival of cells exposed to oxidative stress. Recently, Some HSP are known to associate with vascular reactivity. Under diabetic conditions, there is a abnormal vascular reactivity to relaxing or contracting factors. Abnormal vascular response to some stimuli is an important role in the development of diabetic complications. However, the effects of heat shock on the vascular reactivity in diabetic condition is unclear. Therefore, we investigated effects of heat shock on the vascular reactivity in isolated aorta of streptozotocin-induced diabetic rats. Methods: After mounced in organ bath, aortic ring preparations were exposed to 42℃ for 45 minutes followed by being subjected to contraction and relaxation in 4 hours. Tissues were frozen for measurement of HSP 70 and phosphorylation of myosin light chain after functional study. Results: Heat shock not only increased expression of HSP70 in rat aorta but also augmented contraction to KCI and phenylephrine in the aorta of control and diabetic rats(p<0.05). Relaxation responses to acetylcholine (Ach) were not changed in the aorta of control rats with and without heat shock for 45 minutes. However, heat shock for 45 minutes decreased relaxative responses to Ach in the aorta of diabetic rats compared to those in the aorta of control rats. Conclusion: This result suggests that heat shock increases vascular contractility in the aorta of diabetic and control rats through the induction of HSP70 while heat shock seems to decrease relaxative response in the aorta of diabetic rats compared to control rats(p<0.05). Whether heat shock impaired relaxative response in the aorta of diabetic rats deserves additional studies (J Kor Diabetes Asso 25:343~353, 2001).